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    drm: Add connector property to limit max bpc · 47e22ff1
    Radhakrishna Sripada 提交于
    At times 12bpc HDMI cannot be driven due to faulty cables, dongles
    level shifters etc. To workaround them we may need to drive the output
    at a lower bpc. Currently the user space does not have a way to limit
    the bpc. The default bpc to be programmed is decided by the driver and
    is run against connector limitations.
    
    Creating a new connector property "max bpc" in order to limit the bpc.
    xrandr can make use of this connector property to make sure that bpc does
    not exceed the configured value. This property can be used by userspace to
    set the bpc.
    
    V2: Initialize max_bpc to satisfy kms_properties
    V3: Move the property to drm_connector
    V4: Split drm and i915 components(Ville)
    V5: Make the property per connector(Ville)
    V6: Compare the requested bpc to connector bpc(Daniel)
        Move the attach_property function to core(Ville)
    V7: Fix checkpatch warnings
    V8: Simplify the connector check code(Ville)
    V9: Const display_info(Ville)
    V10,V11: Fix CI issues.
    V12: Add the Kernel documentation(Daniel)
    V14: Crossreference the function name in the doc(Daniel)
    
    Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: Kishore Kadiyala <kishore.kadiyala@intel.com>
    Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
    Cc: Manasi Navare <manasi.d.navare@intel.com>
    Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
    Cc: Sunpeng Li <sunpeng.li@amd.com>
    Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
    Signed-off-by: NRadhakrishna Sripada <radhakrishna.sripada@intel.com>
    Reviewed-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
    Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20181012184233.29250-1-radhakrishna.sripada@intel.com
    47e22ff1
drm_connector.h 43.6 KB